namespace CSharpPro._1021;

public  class UserTestChild:UserTest
{
    public override void M1()
    {
        Console.WriteLine("抽象方法M1");
    }

    public override void M2()
    {
        Console.WriteLine("抽象方法M2");
    }
    public override void M3()
    {
        Console.WriteLine("抽象方法M2");
    }
}